Cisco - Advanced Optical Technology Concepts 606

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© 1999, Cisco Systems, Inc.

Advanced Optical Technology Concepts Session 606

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DPT Agenda • Overview • SRP Protocol and Features • Clocking and Synchronization • Configuration • Application • Products 606 0921_04F9_c3

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© 1999, Cisco Systems, Inc.

DPT Overview • Cisco patent pending technology • New MAC for LAN, MAN and WAN application Spatial Reuse Protocol (SRP)

• Based on ring—dual counter rotating ring • Scalable bandwidth 606 0921_04F9_c3

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DPT Overview

• Spatial reuse • Multicast support • Support traffic prioritization • Multiple nodes can transmit simultaneously 606 0921_04F9_c3

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© 1999, Cisco Systems, Inc.

DPT Overview • Uses the SRP fairness algorithm (SRP-fa) to control access to the ring and enforce fairness No token—unlike Token Ring or FDDI

• Scalable to large number of nodes on the ring Unlike SONET/SDH 606 0921_04F9_c3

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DPT Overview • Uses SONET/SDH framing SRP runs in a concatenated SONET/SDH frame

• Intelligent Protection Switching (IPS) Survivability in the event of fiber facility or node failure, or signal degradation

• Plug-and-play operation 606 0921_04F9_c3

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Spatial Reuse • The SRP protocol derives it’s name from the spatial reuse capability

A

B

• Concept used in rings to increase overall aggregate bandwidth • Unicast packets travels along ring spans between the src and dest nodes only

D

C

Destination stripping 606 0921_04F9_c3

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DPT Ring • A DPT ring is a bi-directional dual counter rotating ring • The rings are referred to as Outer and Inner rings • Both rings are used to transport data and control packets Data packet is sent in one direction and the corresponding control packet is sent the opposite direction 606 0921_04F9_c3

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DPT Ring

GSR

GSR

Control Packet Data Packet

Inner Ring 7500

Outer Ring 7500

Example of a 4 Node DPT Ring 606 0921_04F9_c3

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SRP Packet • SRP is a media independent MAC layer protocol • The initial implementation utilizes SONET/SDH framing • Concatenated payloads only Transport Overhead

Path Overhead

Payload 125 µsec

F L A G

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MAC Header

Payload

F C S

FF LL A A G G

…

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SRP Packet Data

IP Header

+

Payload

SRP Header

+

Payload

SONET/SDH Header

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+ FCS

Encapsulation

Framing

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SRP Packet Format

• There are currently two versions of the SRP MAC packet header Version 1 and 2

• Version 1 is currently in use • Version 2 is an enhancement to version 1 606 0921_04F9_c3

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SRP v1 Generic Header 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 Time to Live (TTL)

RI DS

PRI

• Time to Live (TTL) 11 bit hop count field; decremented each time a node forwards a packet; if the TTL reaches zero the packet is stripped from the ring

MODE

1

P

• Mode Value 000–011

• Ring Identifier (RI-bit) 0

USAGE

Description Unused

100

Topology Control Message

Outer Ring

101

Protection Switching Control Message

Inner Ring

110

MAC Keepalive Control Message

111

Reserved

• Destination Strip (DS-bit) DS == 1 Destination strip DS == 0 Source strip

• Priority Field (PRI) Indicates the priority level of a SRP packet; valid values 0–7, with higher values indicating higher priority 606 0921_04F9_c3

• Usage SRP-fa bandwidth information •

Parity Bit Odd parity over previous 31 MAC header bits

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SRP v1 Data Packet Format 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

Time to Live (TTL)

RI DS

PRI

MODE

Destination MAC Address

P

Source MAC Address

Protocol Type • • •

USAGE

Payload

• • • •

FCS

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SRP v1 Fields • Protocol type 16 bits field; used like that of EtherType Value

1

Protocol Type

0x2007

SRP Control 1

0x0800

IP Version 4

0x0806

ARP

Temporary Number for Cisco Local List of HDLC-Based Ethertypes

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SRP v1 Control Packet Format 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

Time to Live (TTL)

RI DS

PRI

USAGE

MODE

Destination MAC Address

P

Source MAC Address

Protocol Type

Control Type

Payload Length Payload FCS

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SRP v1 Control Fields • Control type 16 bits field; represents the control message type Control Type

Description

0x2007

Topology Discovery

0x0800

IPS Message

0x0806

Reserved

• Payload length 16 bits field; payload length of the control message

• Payload Control message 606 0921_04F9_c3

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SRP v1 Control Packets

• MAC keepalive packet • Topology discovery • Intelligent Protection Switching (IPS)

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SRP v2 Generic Header 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 Time to Live (TTL)

• Time to Live (TTL) 8 bit hop count field; decremented each time a node forwards a packet; if the TTL reaches zero the packet is stripped from the ring

• Ring Identifier (RI-bit)

RI

MODE

PRI

P

• Mode Value 000–011

Description Unused

100

Topology Control Message

0

Outer Ring

101

Protection Switching Control Message

1

Inner Ring

110

MAC Keepalive Control Message

111

Reserved

• Priority Field (PRI) Indicates the priority level of a SRP packet; valid values 0–7, with higher values indicating higher priority

• Parity Bit Odd parity over previous 31 MAC header bits 606 0921_04F9_c3

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SRP v2 Data Packet Format 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 Time to Live (TTL)

RI

MODE

PRI

P

Destination MAC Address Source MAC Address Protocol Type • • • •

• • • •

Payload

FCS 606 0921_04F9_c3

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SRP v2 Control Packet Format 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 Time to Live (TTL)

RI

MODE

PRI

P

Destination MAC Address Source MAC Address Protocol Type Control Type Payload Length • • • •

Payload

• • • •

FCS 606 0921_04F9_c3

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SRP v2 Control Packets

• Usage • Topology discovery • Intelligent Protection Switching (IPS)

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SRP MAC Addressing

• Each interface has a globally unique IEEE 48 bits MAC address Ethernet style

• To support multicast a multicast bit is defined using canonical addressing conventions 606 0921_04F9_c3

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SRP Control Packets • All control packets are sent point-to-point The DA MAC address is set to zero (0x0)

• All control packets except MAC keepalive packets are sent with the highest priority PRI == 0x7 606 0921_04F9_c3

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Single Subnet

• In the initial implementation the single subnet approach is used Both Outer and Inner rings are on the same IP subnet

• This enables rapid re-optimization of ring path selection and minimize route flaps in a ring wrap situation 606 0921_04F9_c3

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Single Subnet

• Ring wraps are handled by the lower layer and thus transparent to layer 3 routing protocols

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SRP Protocol and Features • Packet processing

• Ring selection

• Multicasting

• Topology discovery

• Priority

• Intelligent Protection Switching (IPS)

• Fairness • Pass-through

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• Management

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Ring Packet Flow SRP-LC

Ring A

SRP-LC

O-Rx

O-Tx

I-Tx

I-Rx

MAC

MAC

L3

L3

I-Tx I-Rx

MAC

O-Tx O-Rx

I-Rx

MAC

I-Tx

Ring B

O-Rx O-Tx

MAC

MAC

L3

L3 I-Rx

I-Tx

O-Tx

O-Rx

MAC

MAC

SRP-LC 606 0921_04F9_c3

SRP-LC 29

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Rx Queue

L3 Switching

Hi Priority Lo Priority

Hi Priority Lo Priority

Node Packet Flow

Tx Queue

CAM Transit Buffer O-Rx I-Tx SRP MAC

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Hi Priority Lo Priority Hi Priority Lo Priority

Transit Buffer

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O-Tx I-Rx SRP MAC

CAM

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Receive Packet Handling

• Packet acceptance and processing

Control Data Packet Packet Processing Processing

• Control packet processing • Multicast handling

Transit Buffer

• Accounting Rx Fiber

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Lo Priority Hi Priority

Address Lookup

Rx Packet Processing

Hi Priority Lo Priority

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Receive Packet Handling Six Things Can Happen to an Incoming Packet • Stripped • Forwarded • Received and stripped

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• Received and forwarded • Wrapped • Pass-through

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Address Lookup • Associated with each SRP MAC there is a Content Addressable Memory (CAM) • The CAM is structured as a source and destination address pool • The CAM source address pool contains special operation bits Reject bit, NE bit and SA bit 606 0921_04F9_c3

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Address Lookup

• The CAM source address pool also has a subset of byte and packet counters associated with it • Users can selectively filter or do source accounting for packets arriving from a specific node on the ring 606 0921_04F9_c3

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SRP v1 CAM Src Addr Index

Reject Bit

Reserved 63

58 57

NE Bit

SA Bit

51 50 49 48 47

0

Mac Addr

63

0

32 31

Byte Counter

0

Packet Counter

Source Counters

1024

Source Address Pool

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© 1999, Cisco Systems, Inc.

SRP v2 CAM SAA/ Reject

NE SAM 3

2

1

DAH 0 55

SA Bit

Reserved 49 48 47

0

Mac Addr

63 0

32 31

Byte Counter

0

Packet Counter

Source Counters

2048 Status Bits

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Source Address Pool

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Multicast • SRP provides direct support for IP multicast • IP multicast uses class D address space • The class D multicast address is mapped to the appropriate 48 bit MAC address for transport on the ring 606 0921_04F9_c3

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© 1999, Cisco Systems, Inc.

Multicast

7 Byte 1

6

5

4

3

2

1

0

0 0 0 0 0 0 0 1

Byte 2 0 0 0 0 0 0 0 0

Multicast Bit 00:00:5E

Byte 3 0 1 0 1 1 1 1 0 Byte 4

0 0 0 0 0 0 1 0 Byte 5 1 0 1 0 1 1 1 1

224.2.175.237

Byte 6 1 1 1 0 1 1 0 1

Multicast MAC Address == 01:00:5E:02:AF:ED

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Multicast Handling

• The source node handles the IP multicast address to MAC address mapping • Nodes interested in receiving the multicast packet creates an entry for the MAC address in their CAM

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Multicast Handling • Arriving multicast packets with a matching DA are forward to the host processing module • Unlike unicast packets multicast packets are source stripped • The multicast packets are placed into the transit buffer for continued circulation 606 0921_04F9_c3

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Transmit Packet Handling Transmit Queues

• Priority handling

Lo Priority

Hi Priority

• Transmit decision algorithm • Fairness

Transit Buffer Hi Priority

X

Lo Priority

High Threshold

Tx Fiber

Low Threshold Fairness Signaling

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Priority Handling • SRP provides support for packet prioritization and expedited priority packet handling for the transmit queue and transit buffer • Motivation—provide support for real time, mission critical applications and control traffic Which requires expedited handling and stricter delay bounds and jitter constraints 606 0921_04F9_c3

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Priority Handling

• The priority field is set by the node sourcing a packet onto the ring • The node utilizes a mapping between the IP precedence bits in the ToS field into the SRP MAC header priority field 606 0921_04F9_c3

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Priority Handling

• A configured priority threshold is used to determine if the packet should be placed in the high or low priority queues Mapping 8 levels of priority to 2 levels

• This is the same for both locally sourced packets and transit packets 606 0921_04F9_c3

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Transmit Decision Algorithm

• The following hierarchy is enforced for packet scheduling 1. High priority transit packets 2. High priority transmit packets 3. Low priority transmit packets 4. Low priority transit packets 606 0921_04F9_c3

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Transmit Decision Algorithm • The packet priority hierarchy can be modified by placing thresholds on the low priority transit buffer depth to ensure The transit buffer doesn’t overflow while serving the locally sourced traffic That low priority transit traffic doesn’t wait too long behind locally sourced low priority traffic 606 0921_04F9_c3

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Transmit Decision Algorithm

• Avoid discarding packets which are already circulating on the ring

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SRP Fairness Algorithm • SRP-fa is the mechanism that ensures Global Fairness—each node gets a fair share of the ring bandwidth Local Optimization—node maximally leverage the spatial reuse properties of the ring Scalability—the ability to build large rings with many nodes that spans across large geographically distributed area 606 0921_04F9_c3

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SRP-fa (Transmit) MY_USAGE ≤ ALLOW_USAGE ≤ MAX_ALLOW • Incremented when transmitting low priority transmit packets MY_USAGE = MY_USAGE + PAK_LEN

Transmit Rate Counter

• MY_USAGE gets decremented by a fixed fraction at regular intervals Threshold • ALLOW_USAGE set according to feedback received by neighbours • Can decay upwards to MAX_USAGE • MAX_ALLOW static pre-configured parameter 606 0921_04F9_c3

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SRP-fa (Forward) FWD_RATE • Incremented when transmitting low priority transmit packets FWD_RATE = FWD_RATE + PAK_LEN

Forward Rate Counter

• FWD_RATE gets decremented by a fixed fraction at regular intervals

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SRP-fa

• High priority transmit packets are not rate controlled by the SRP-fa Committed Access Rate (CAR)

• Excess transit packets are not rate limited by the node instead it generates a fairness message 606 0921_04F9_c3

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SRP-fa • Throttling is done by not sourcing packets until MY_USAGE < ALLOWED_USAGE

• Usage field contains bandwidth information and are sent periodically even if there is no new bandwidth information to send Where there is no new bandwidth information to send a null value is sent 606 0921_04F9_c3

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SRP v2 Usage Packet Format 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5

Time to Live (TTL) RI MODE

PRI

P

Reserved Usage Reserved Message

FCS

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SRP-fa Operation Example

200Mbps

B

A Source

Sink

200Mbps

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SRP-fa Operation Example

400Mbps

C

B

A Sink

200Mbps

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200Mbps

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SRP-fa Operation Example

600Mbps

D

C

B

A Sink

200Mbps

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200Mbps

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200Mbps

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SRP-fa Operation Example

622Mbps

E

D

C

B

A Sink

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200Mbps

200Mbps

200Mbps

200Mbps

155Mbps

155Mbps

155Mbps

155Mbps

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Topology Discovery

• Each node performs topology discovery by sending out topology discovery packets on the Outer ring • Each node on the ring appends its MAC address binding, updates the length field and sends it to the next node on the ring 606 0921_04F9_c3

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Topology Discovery

• If there is a wrap on the ring the wrapped node will indicate a wrap when appending its MAC binding and wraps the packet • When a topology packet follows a wrap, MAC binding and wrap status are not appended to the packet 606 0921_04F9_c3

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Topology Discovery

• The packet has to be received on the same ring ID before it can be accepted • Upon receiving 2 consecutive topology packets that are identical the node builds the topology map

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Topology Discovery

• The topology map includes information such as the MAC address and wrap status of each node on the ring

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Topology Packet Format (v1) 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

Time to Live (TTL)

PRI RI DS (0x7)

Destination MAC Address (0x000000)

Protocol Type (0x2007) Payload Length

MODE (0x4)

USAGE

P

Source MAC Address Control Type (0x0001) MAC Type

Mac Address Other MAC Bindings

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Topology Packet Format (v2) 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 Time to Live (TTL)

RI

MODE

PRI

P

Destination MAC Address (0x000000) Source MAC Address Protocol Type (0x2007) Control Type (0x0001) Payload Length MAC Type MAC Address

Other MAC Bindings 606 0921_04F9_c3

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MAC Type

MAC Type—8 Bits 0

Reserved

1

Ring ID 0—Outer Ring 1—Inner Ring

2

Wrap Status 0—Node Unwrapped 1—Node Wrapped

3–7

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Reserved

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Ring Selection • Ring selection is done by ARP’ing

A

B

• ARP request is sent on Outer and Inner ring in alternating order • Responding node uses its topology map to determine which ring to send the respond • Requesting node uses respond to determine ring selection 606 0921_04F9_c3

D

ARP Respond

ARP Request

C

Topology Map

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Ring Selection

• When a node detects a ring wrap it issues a gratuitous ARP which is used to update the ARP table of all nodes on the ring • Static ARP can be used to force the selection of a particular ring

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Pass-Through Mode

• Handles router hardware or software problem • Automatic or manual triggers • Avoid ring wraps or partitioning 606 0921_04F9_c3

MAC

X X

MAC

X X

O-Rx I-Tx

I-Rx O-Tx

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Pass-Through Mode • In this mode the node appears invisible to the ring • Control and data packets are passed directly to the transit buffer without any CAM look-up or control packet detection • The transit buffer still has high and low priority queues but behaves as a simple buffer 606 0921_04F9_c3

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Pass-Through Mode

• The node cannot source packets onto the ring • TTL not decremented • FWD_RATE counter not incremented • SRP-fa not executed 606 0921_04F9_c3

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Pass-Through Mode • There are two ways the SRP MAC will go into pass-through mode Watchdog timer expires CLI

• To exit pass-through mode L3 is up and running again CLI 606 0921_04F9_c3

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Intelligent Protection Switching • IPS provides SRP with a powerful self healing feature which automatically recovers from fiber facility or node failure, or signal degradation • IPS is analogous to the self healing properties of SONET/SDH rings but without the need to allocate protection bandwidth 606 0921_04F9_c3

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IPS • Proactive fault and performance monitoring • Event detection and reporting • Signal processing and propagation to communicate faults detected or clearances Allow for rapid recovery and restoration 606 0921_04F9_c3

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IPS • Topology knowledge independence • Ring wrapping to bypass failed fiber or node Transparent to the Layer 3 routing protocols

• Protection switching event hierarchy • Ring restores in ≤ 50 msecs 606 0921_04F9_c3

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IPS Packet Format (v1) 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

Time to Live (TTL)

PRI RI DS (0x7)

MODE (0x5)

USAGE

P

Destination MAC Address (0x000000) Source MAC Address Protocol Protocol Type Type (0x2007) (0x2007)

Control Control Type Type (0x0002) (0x0002)

Payload Length Mac Address IPS Byte

Reserve Byte

FCS

FCS

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IPS Packet Format (v2) 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 Time to Live (TTL)

RI

MODE

PRI

P

Destination MAC Address (0x000000) Source MAC Address Protocol Type (0x2007) Control Type (0x0001) Payload Length Source MAC Address IPS Byte

Reserve Byte FCS

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IPS Byte IPS Byte—8 Bits 0–3

4

5–7

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IPS Request Type 1111—Lockout of Protection (LO) 1101—Forced Switch (FS) 1011—Signal Fall (SF) 1000—Signal Degrade (SD) 0110—Manual Switch (MS) 0101—Wait to Restore (WTR) 0000—No Request (0) Path Indicator 0—Short (S) 1—Long (L) Status Code 010—Protection Switch Completed [Traffic Wrapped] (W) 000—Idle (0)

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IPS Request Type (Automatic) • Signal Fail (SF) Performs a wrap; caused by a “hard failure”—LOS, LOF, Line BER above a specified threshold, Line AIS, keepalive failure or excessive CRC errors

• Signal Degrade (SD) Performs a wrap; caused by “soft failure”—Line BER above a specified threshold or excessive CRC errors

• Wait to Restore (WTR) When a wrap condition clears instead of unwrapping immediately the node waits for a configured period of this before unwrapping; this is to prevent protection switch oscillation 606 0921_04F9_c3

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IPS Request Type (Operator Originated) • Lockout of Protection (LO) Prevents ring wraps anywhere in the ring; if a wrap is present it causes it to drop (note: feature not supported at FCS)

• Forced Switch (FS) Performs a wrap at the node at which this command was issued and at the adjacent node

• Manual Switch (MS) Similar to FS but at a lower priority 606 0921_04F9_c3

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Protection Request Hierarchy Highest Priority

• Lockout of Protection (LO) • Forced Switch (FS) • Signal Fail (SF) • Signal Degrade (SD) • Manual Switch (MS) • Wait to Restore (WTR)

Lowest Priority 606 0921_04F9_c3

• No Request (IDLE)

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Protection Request Hierarchy • Request ≥ SF and < LO can co-exist • LO request can co-exist • Request < SF cannot co-exist with other request • A node always honors the highest of short path request and self detected request (fault) 606 0921_04F9_c3

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Protection Request Hierarchy

• When there are more request of type < SF the first request to complete the long path signaling takes precedence • When there exist 2 request of the type < SF on both the inner and outer ring the node chooses the request on the outer ring 606 0921_04F9_c3

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Path Indication

• Short path • Long path

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Path Indication • Short path Short path IPS packets {Req,Src,Stat,S} are IPS packets sent over the adjacent failed span Short path IPS packets are never forwarded, it is stripped by the receiving node A node wraps and unwraps only on the short path request (never on the long path) 606 0921_04F9_c3

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Path Indication • Long path Long path IPS packets {Req,Src,Stat,L} are IPS packets sent around the ring Long path IPS packets are always forwarded IPS packets are newer wrapped Long path IPS packets are used to maintain protection hierarchy 606 0921_04F9_c3

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IPS Triggers • Hard failure

• Operator

Signal Fail (SF)

• Soft failure Signal Degrade (SD)

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Lockout of Protection (LO) Forced Switch (FS) Manual Switch (MS)

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SONET/SDH Overhead Usage • Loss of Frame (LOF) A1 and A2 overhead bytes

• Loss of Signal (LOS) • Alarm Indication Signal (AIS) • Bit Error Rate (BER) B2 overhead byte 606 0921_04F9_c3

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IPS States

• Idle • Pass-through • Wrapped

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IPS States • Idle The node is ready to perform a protection switch; at this state it sends IPS idle packets {0,Self,0,S} to both of the adjacent nodes

• Pass-through The node enters this state when it receives a long path IPS packet {Req,Src,Stat,L} 606 0921_04F9_c3

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IPS States

• Wrapped The node enters this state when it receives a local request or detects a fault or receives a short path IPS packet from an adjacent node Performs a wrap

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Wrapped Packet Flow SRP-LC

SRP-LC O-Rx

MAC

I-Tx

X

O-Tx MAC

I-Rx

L3

L3 Wrapped

Wrapped I-Tx I-Rx

MAC

O-Tx O-Rx

I-Rx

MAC

I-Tx

O-Rx O-Tx

MAC

MAC

L3

L3 I-Rx

I-Tx

O-Tx

O-Rx

MAC

MAC

SRP-LC 606 0921_04F9_c3

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SRP-LC 90

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IPS Operation

Idle

{0,A,0,S}

A

B

D

C

Idle

Idle

Idle

Normal Working 606 0921_04F9_c3

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IPS Operation {SF,B,W,S}

Wrapped

A

{SF,A,W,L}

B

Wrapped

Fiber Cut {0,A,W,S} X {SF,B,W,L}

D

C

Pass-Through

Pass-Through

1 Fiber Failure 606 0921_04F9_c3

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IPS Operation X Wrapped

{SF,B,W,S}

A

{SF,A,W,L}

B

Wrapped

Fiber Cut {SF,A,W,S} X {SF,B,W,L}

D

C

Pass-Through

Pass-Through

2 Fiber Failure 606 0921_04F9_c3

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IPS Operation Signal Degrade {0,B,W,S}

A

B

{SD,A,W,L} {SD,A,W,S} {SD,B,W,L}

D

C

Signal Degrade 606 0921_04F9_c3

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IPS Operation Signal Degrade {SF,B,W,L}

A

B {SF,B,W,S}

X Fiber Cut

C

X

D

{SF,D,W,S}

Signal Degrade and Fiber Failure 606 0921_04F9_c3

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IPS Operation Signal Degrade {SF,B,W,L}

A

B {SF,B,W,S}

X Fiber Cut

{SF,D,W,L}

C

X

D

{SF,D,W,S}

Signal Degrade and Fiber Failure 606 0921_04F9_c3

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IPS Operation Signal Degrade

A

B

Fiber Cut

D

C

Signal Degrade and Fiber Failure 606 0921_04F9_c3

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IPS Operation {WTR,B,W,S}

Wrapped (Enter WTR)

A

B

Wrapped (Enter WTR)

{WTR,A,W,L} {WTR,A,W,S} {WTR,B,W,L}

D

C

Pass-Through

Pass-Through

Fault Clears 606 0921_04F9_c3

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IPS Operation {0,B,0,S}

WTR Expire

A

B

WTR Expire

{0,A,0,S} {0,A,0,S} {0,B,0,S}

D

C

Idle

Idle

Fault Clears 606 0921_04F9_c3

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IPS Operation {0,B,0,S}

Idle

A

B

Idle

{0,A,0,S} {0,A,0,S} {0,B,0,S}

D

C

Idle

Idle

Fault Clears 606 0921_04F9_c3

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Detecting a New Neighbour E

Outer Ring Neighbour–B Inner Ring Neighbour–C

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{0,A,0,S}

{0,B,0,S}

A

B

D

C

Outer Ring Neighbour–D Inner Ring Neighbour–A

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Detecting a New Neighbour E

Outer Ring Neighbour–B Inner Ring Neighbour–C

{SF,A,W,S}

A

X

X

{SF,B,W,S}

B

{SF,A,W,L}

{SF,B,W,L}

D

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Outer Ring Neighbour–D Inner Ring Neighbour–A

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C

102

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Detecting a New Neighbour {0,E,0,S}

E

Outer Ring Neighbour–B Inner Ring Neighbour–C

A

B

A Detects New Neighbour

B Detects New Neighbour

D

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Outer Ring Neighbour–D Inner Ring Neighbour–A

C

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Detecting a New Neighbour {0,E,0,S}

E

Outer Ring Neighbour–E Inner Ring Neighbour–C

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A

B

D

C

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Outer Ring Neighbour–D Inner Ring Neighbour–E

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DPT Management • RFC 1595 SONET/SDH MIB Current status and alarm Current and historical Errored Seconds (ES), Severe Errored Seconds (SES), Severe Errored Framing Seconds (SEFS), Coding Violations (CV) and Unavailable Seconds (UA) counts

• Topology discovery MIB • SRP MAC statistics 606 0921_04F9_c3

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Clocking and Synchronization

• 3 scenarios ADM WDM Direct to fiber

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ADM SRP-LC

ADM

SRP-LC O-Rx I-Tx

O-Tx I-Rx I-Tx O-Rx

ADM

I-Rx O-Tx

SONET/SDH Network PRC

ADM

O-Tx I-Rx I-Tx O-Rx

SRP-LC

• Clock derived from SONET/SDH network • Looped or line timed 606 0921_04F9_c3

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WDM or Direct to Fiber SRP-LC O-Rx I-Tx

WDM

WDM

~ ~

~ ~ ~

I-Rx O-Tx 20ppm

SRP-LC O-Tx I-Rx

20ppm

I-Tx O-Rx

Direct to Fiber or through Regen

• Clock derived from internal oscillator • Internal oscillator has an accuracy of ± 20ppm • Internal clocking Similar to doing POS back to back 606 0921_04F9_c3

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WDM or Direct to Fiber • No need for central clock source • No complex clocking requirements • No BITS interface BITS—Building Integrated Timing Supply

• Although it is a ring topology clocking is point-to-point 606 0921_04F9_c3

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Mix SRP-LC O-Tx I-Rx

SRP-LC ADM SONET/SDH ADM O-Rx I-Tx

Network

20ppm O-Tx

I-Tx

PRC

I-Rx

~ ~

O-Rx

~ ~

O-Rx

I-Rx O-Tx

I-Tx

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SRP-LC

20ppm

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Configuration Commands

mfr-jc1(config-if)#int srp 0/0 mfr-jc1(config-if)#ip addr 10.0.0.5 255.0.0.0 mfr-jc1(config-if)#no shut

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Configuration Commands

mfr-jc1(config-if)#int srp 0/0 mfr-jc1(config-if)#srp ? clock-source Configure clock source count Count packets based on source mac address flag Specify SONET/SDH overhead values framing Specify SONET/SDH framing and corresponding s1s0 defaults ips Modify IPS parameters reject Reject packets based on source mac address topology-timer Specify topology timer

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Configuration Commands

mfr-jc1(config-if)#srp clock-source ? internal Use internal clock (default) line Recover clock from line mfr-jc1(config-if)#srp clock-source internal ? a Specify clock source on side A (default internal) b Specify clock source on side B (default internal) mfr-jc1(config-if)#srp clock-source line ? a Specify clock source on side A (default internal) b Specify clock source on side B (default internal)

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Configuration Commands mfr-jc1(config-if)#srp flag ? c2 Path Signal Label byte (default 0x16) j0 Section Trace byte (default 0xCC) s1s0 Bits s1 and s0 of H1 byte (default 0) mfr-jc1(config-if)#srp framing ? sdh Select SDH framing and s1s0=2 sonet Select SONET framing and s1s0=0 (default) mfr-jc1(config-if)#srp framing sonet ? a Specify framing and s1s0 on side A (default SONET, s1s0=0) b Specify framing and s1s0 on side B (default SONET, s1s0=0)

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Configuration Commands mfr-jc1(config-if)#srp ips ? request Specify IPS request timer Specify IPS timer wtr-timer Specify IPS WTR timer mfr-jc1(config-if)#srp ips request ? forced-switch Forced Switch request manual-switch Manual Switch request mfr-jc1(config-if)#srp ips request forced-switch ? a Specify IPS request on side A b Specify IPS request on side B mfr-jc1(config-if)#srp ips timer ? <1-60> value in seconds mfr-jc1(config-if)#srp ips wtr-timer ? <10-600> value in seconds 606 0921_04F9_c3

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Configuration Commands

mfr-jc1(config-if)#srp count ? H.H.H 48-bit source address mfr-jc1(config-if)#srp reject ? H.H.H 48-bit source address mfr-jc1(config-if)#srp topology-timer ? <10-600> value in seconds

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Show Commands mfr-jc1#sh ver Cisco Internetwork Operating System Software IOS (tm) GS Software (GSR-P-M), Experimental Version 11.2(19990310:232845) [gsuwala-gsr_merlin_112eft 166] Copyright (c) 1986-1999 by cisco Systems, Inc. Compiled Mon 22-Mar-99 09:43 by gsuwala Image text-base: 0x600108E0, data-base: 0x60704000 [snip] cisco 12008/GRP (R5000) processor (revision 0x01) with 131072K bytes of memory. R5000 processor, Implementation 35, Revision 2.1 (512KB Level 2 Cache) Last reset from power-on 1 Route Processor Card 1 Clock Scheduler Card(s) 3 Switch Fabric Card(s) 1 one-port OC12 SONET based SRP controller (1 SRP). 1 Ethernet/IEEE 802.3 interface(s) 507K bytes of non-volatile configuration memory. [snip] 606 0921_04F9_c3

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Show Commands mfr-jc1#sh int srp 0/0 SRP0/0 is up, line protocol is up Hardware is SRP over SONET, address is 1000.0000.5555 (bia 0010.1f42.a400) Internet address is 10.0.0.5/8 MTU 9000 bytes, BW 622000 Kbit, DLY 100 usec, rely 255/255, load 1/255 Encapsulation SRP, loopback not set Last input 00:00:01, output 00:00:00, output hang never Last clearing of "show interface" counters 6d21h Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 45000 bits/sec, 2 packets/sec 5 minute output rate 51000 bits/sec, 3 packets/sec 1041110404 packets input, 801583966 bytes, 1 no buffer Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 270 input errors, 270 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 2388439 packets output, 3782249550 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 output buffer failures, 0 output buffers swapped out mfr-jc1#

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Show Commands

mfr-jc1#sh srp ? SRP ips source-counters topology

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Spatial Reuse Protocol Interface IPS information Source counter information Topology map

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Show Commands mfr-jc1#sh srp IPS Information for Interface SRP0/0 MAC Addresses Side A (Outer ring RX) neighbour 1000.0000.4444 Side B (Inner ring RX) neighbour 1000.0000.1111 Node MAC address 1000.0000.5555 IPS State Side A not wrapped Side B not wrapped Side A (Inner ring TX) IPS pkt. sent every 1 sec. (next pkt. after 0 sec.) Side B (Outer ring TX) IPS pkt. sent every 1 sec. (next pkt. after 0 sec.) IPS WTR period is 10 sec. (timer is inactive) Node IPS State IDLE IPS Self Detected Requests Side A IDLE Side B IDLE IPS messages received Side A (Outer ring RX) {1000.0000.4444,IDLE,S,1024} Side B (Inner ring RX) {1000.0000.1111,IDLE,S,1024} IPS messages transmitted Side A (Inner ring TX) {1000.0000.5555,IDLE,S,1024} Side B (Outer ring TX) {1000.0000.5555,IDLE,S,1024} 606 0921_04F9_c3

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Show Commands

Topology Map for Interface SRP0/0 Topology pkt. sent every 10 sec. (next pkt. after 4 sec.) Last received topology pkt. 00:00:05 Nodes on the ring: 4 Hops (outer ring) Address 0 1000.0000.5555 1 1000.0000.2222 2 1000.0000.3333 3 1000.0000.4444 mfr-jc1#

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Sample DPT Topology

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mrf-jc1 1000.0000.5555 10.0.0.5/8

brf-jc3 1000.0000.4444 10.0.0.4/8

bfr-jc1 1000.0000.2222 10.0.0.2/8

mrf-jc2 1000.0000.3333 10.0.0.3/8

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Show Commands

mfr-jc1#sh cont srp ? <0-15> SRP interface number details show all the details for the interface

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Show Commands mfr-jc1#sh cont srp SRP0/0 - Side A (Outer RX, Inner TX) SECTION LOF = 0 LOS = 0 RDOOL = 0 Active Alarms: None LINE AIS = 0 RDI = 0 FEBE = 0 Active Alarms: None PATH AIS = 0 RDI = 0 FEBE = 0 LOP = 0 NEWPTR = 0 PSE = 0 Active Alarms: None APS Rx(K1/K2) = 00/00 S1S0 = 00 C2 = 16 CLOCK SOURCE Internal PATH TRACE BUFFER : STABLE Remote hostname : bfr-jc3 Remote interface: SRP0/0 Remote IP addr : 10.0.0.4 Remote Ring id : Outer 606 0921_04F9_c3

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BIP(B1) = 0

BIP(B2) = 0

BIP(B3) = 0 NSE = 0

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Show Commands SRP0/0 - Side B (Inner RX, Outer TX) SECTION LOF = 0 LOS = 0 RDOOL = 0 Active Alarms: None LINE AIS = 0 RDI = 0 FEBE = 64 Active Alarms: None PATH AIS = 0 RDI = 0 FEBE = 52 LOP = 0 NEWPTR = 0 PSE = 0 Active Alarms: None APS Rx(K1/K2) = 00/00 S1S0 = 00 C2 = 16 CLOCK SOURCE Internal PATH TRACE BUFFER : STABLE Remote hostname : bfr-jc1 Remote interface: SRP0/0 Remote IP addr : 10.0.0.1 Remote Ring id : Outer

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BIP(B1) = 1638

BIP(B2) = 5088

BIP(B3) = 1662 NSE = 0

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Debug Commands

mfr-jc1#debug srp ? error SRP protocol errors ips SRP IPS packet SRP packets periodic SRP periodic activity topology SRP topology

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Application

• POP Interconnect • Campus Ring • Metro/City Ring • Hierarchical Ring

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POP Interconnect Before

After

FDDI (100Mbps)

SRP 2X622Mbps

POS

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Campus Ring

Campus Ring

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Metro/City Ring—SONET/SDH

ADM

ADM

SONET/SDH Network ADM

ADM

Requires Concatenated Interfaces on the ADM 606 0921_04F9_c3

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Metro/City Ring—Direct to Fiber/WDM WDM

WDM

~ ~

~ ~ Direct to Fiber

Regen

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Regen

Regen

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Hierarchical Ring Backbone Backbone

GSR 7XXX

GSR

7XXX

7XXX

Access Ring 7XXX

GSR

7XXX

7XXX

7XXX

Access Ring

MAN GSR

7XXX

7XXX

7XXX

Access Ring GSR 7XXX 606 0921_04F9_c3

7XXX

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DPT Product Highlights

• GSR linecard • 7500 dual wide port adapter • Multi-mode and single-mode • IR and LR • 1310 nm 606 0921_04F9_c3

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DPT Products Highlights

• Concatenated SONET/SDH frames only Initially OC-12c or AU4-4-4c

• Initial MAC implementation on FPGA • Ring Access Controller ASIC (RAC) OC-48/STM-16 rings 606 0921_04F9_c3

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DPT GSR Line Card

• Initial release single SRP OC-12/STM4 ring Dual port—coming

• Initial release based on the TTM-48 engine • Full fabric required 606 0921_04F9_c3

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GSR DPT Linecard SRP

TTM48 Pkt Mem

TB 512KB

CAM

RxSOP

BMA48

MAC

Salsa

Framer I-Tx

I-Rx

B

Framer

MAC

P4 L2 Cache

Fabric

DRAM

O-Rx

A

FIA48

O-Tx

TB 512KB

CAM

TxSOP

BMA48

FIA48

Pkt Mem 606 0921_04F9_c3

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DPT Port Adaptor • Single SRP OC-12/STM-4 ring • Dual wide PA • Hardware-based layer 2 CoS 32 Mbytes Rx buffering RED and DRR

• FCS release on VIP2-50 migrating to VIP4 606 0921_04F9_c3

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7500 DPT PA TB 512KB

CAM

SDRAM 32MB

O-Rx Framer

MAC

RxPCI

To PCI

Framer

MAC

TxPCI

From PCI

I-Tx

I-Rx O-Tx TB 512KB

606 0921_04F9_c3

CAM

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SDRAM 512KB

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Conclusions

• Innovative and scalable packet ring technology • LAN, MAN and WAN applications • Cost effective and bandwidth efficient • IP services enabler 606 0921_04F9_c3

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Please Complete Your Evaluation Form Session 606

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